Second order scalar perturbations induced by primordial curvature and tensor perturbations by Zhe Changa et al. on Wednesday 23 November

The primordial perturbations will inevitably generate higher order

perturbations. We study the second order scalar perturbations generated by the

primordial curvature and tensor perturbations in the radiation-dominated era.

After presenting all the possible second-order source terms, we obtain the

explicit expressions of the kernel functions and the power spectra of the

second order scalar perturbations. The contributions from the initial

second-order perturbations are considered. We calculate the power spectra of

second order scalar perturbations for different tensor-to-scalar ratio $r$.

arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.11948v1